Improved coal and ash sifter



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a? ffm N PETERS, FHOTO-LITHOGRAPHER WASHENGTON. D C.

' UNITED STATES PATENT OFFICE.

ABIJAH E. BLOOD AND JOSIAH B. BLOOD, OF LYNN, MASSAOIIUSETTAS- SIGNORS TO THEMSELVES AND WIM. J. AND BENJ. F. LARABE, OF SAME PLACE.

lMPPtOvi-:D COAL AND ASH'SIFTEP..

Specification forming part of Letters Patent N0.46.293, dated February 7,1865.

To all 'whom it may concern Be it known that we, ABIJAH E. BLOOD and `JosIAH B. BLOOD, of Lynn, in the county of Essex and State ot' Massachusetts, have invented new and useful improvements in the vconstruction of sieves or sifters for sifting We form our sitter with circular hoops or Y case, much after the style of ordinary sieveca-ses, marked A A B B in the drawings. of which Figure I shows a perspective view.` The case consists ot' two parts, marked A A and B B, the upper part being of smaller circumference than the lower portion, in which it is placed, so that it forms at its junction with said lower part a recess all round the. inside ot' the part of the ease B B, which is made to iiare outward. In this recess we place a movable hoop or bottom, C C, so that it can play c'osely against the lower edge of the upper p irt ofthe case A A, sustained below by the cross-barO and the rod D, (shown in thedrawings,) and which are hereinafter more fully'described. This hoop or bottom is thus made capable of a free vibratory movement in a horizontal direction around the interior of the lower part of the case, working upon a central pivot, N. Upon this movable hoop or bottom C O weplace the screen or wire-cloth Ill, fastening it in such manner as to form a separate but close bottom to the upper part ot' lthe case, (marked A A,) to prevent the, escape of material and still not interfere with thefree movementofthe hoops or bottom U O with the attached screen E. We do not place the screen or wire-cloth E upon said hoop O C in a horizontal plane, as usual in sifters, but give it a considerable convexity upward, so that it shall be an inch, more or less, higher at the center than at the circumt'erence. By this meurs we give the material to be sifted a tendency to shift to the outer edge ot' thev screen, and thus break up the dead-center or central body of the material, which does not receive sufficient motion upon a flat screen to pass the ashes or dust through the meshes of the screen. 1

For the purpose of giving movement to the screen or bottom ot' the sifter we pass the bel fore-named rod D through the sides of the hoop or bottom C O and directly across the middle of the screen E. This rod D is made at each end to project through the hoop C G any required length, the projections resting upon and playing in slots in the part of the case marked B B, one of the ends being continued beyond said case sufficiently to serve for a handle. By applying the hand to this projecting rod or handle a reciprocating or vibratory 'motion may be produced sutlicient for sifting ashes or other material.

The cross-bar O passes from side to side of the case A A B B at right angles with the operating-rod D, and just beneath the hoop or rim OG, and is firmly fastened at each end to the interior of the lower part ofthe case B B. Both the cross-bar O and the operating rod l) are bent upward with a curvature corresponding to the couvexity of the screen E, and are attached thereto and to each other at the point of crossing by the pivot N.

Fig. II shows the movable bottom detached from the oase. Fig. III represents a section through the middle of the sitter, and plainly shows the convexity of the screen E.

By the use ofa thick narrow hoop we form a rim or flange upon the outside of the case, which servesto support the sitter upon a common barrel or other suitable receptacle for the dust or coal-ashes. When the case is made of sheetiron, the lower part of the case B B may be conveniently ared out, so as to shut over the receptacle, and rest upon projectionsd placed on the interior near the lower edge.

What, therefore, we claim as our invention, and desire to secure by Letters Patent, is

l. The construction of coal-sfters with a vibratory bottom, O O, separate from the iuclosing-case B B A A, carrying the screen or Wirecloth E, with free movementindependently of the stationary case.

2. The construction of the vibratory bottom or screen E with a decided convexity upward.

3. The combination of the case A A B B with the cross-bar O, fastened thereto, the operatingrod D and the independent convex screen E, substantially as described, and for the purpose set forth,

Lynn, October 10, 1864.

. ABIJAH E. BLOOD. ln presence of J. B. BLOOD.

EDWARD B. GoLDsMITH, EMMA E. KING. 

